What does embodied energy and carbon refer to in a product lifecycle context?

• A. They refer to energy used by consumers when using product.
• B. They are the energy used to recycle products.
• C. They measure only carbon emissions during disposal.
• D. Embodied energy and carbon are the energy and GHGs embedded in materials and manufacturing up to the point of use, measured in LCA/LCC contexts.

Answer: (D)

Embodied energy and embodied carbon capture the energy inputs and greenhouse gas emissions that are locked into a product from the moment its materials are extracted through manufacturing and fabrication, up to the point the product is ready for use. In life cycle assessment (LCA) or life cycle costing (LCC) contexts, these metrics quantify the total energy demand and the associated emissions embedded in the materials and processes before the product is actually used. This helps compare how different materials or production routes contribute to a product’s overall footprint, independent of how it is used or disposed.

So, for example, the energy used to mine, refine, transport, and manufacture the raw materials, along with the energy consumed in shaping and assembling the final product, is counted as embodied energy, and the corresponding greenhouse gas emissions are counted as embodied carbon. This distinguishes it from energy or emissions that occur during use, or those tied to recycling or disposal.